フレーム構造の弾塑性地震応答のモード解析

概要

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In recent years, elastic-plastic seismic responses of local stresses and defornations of individual structural members of tall and complicated framed structures have been analyzed. However, discussion on modal property of such detailed responses has not been presented before. This paper first presents a nodal method of analysis, which uses the mass condensation method, applicable to structures having numerous degrees of freedom and performing severe nonlinear behaviors. Secondly, this method is applied to examples of 2-15 storied framed structures. As a result, it is shown that for structures of about 10 stories and below the lst mode solutions are good approximations of overall responses, such as horizontal displacements of the top of the structures, and that for these same structures local responses, such as rotation angles of plastic hinges, can also be roughly estimated by the 1st mode solutions.
1996-07-30